Specifications:- Sanding Bands Size:- 80# Grit(Outer Dia.xLength): 5/16"" x 1/2"" (8.5 x 13 mm)- 120# Grit(Outer Dia.xLength): 5/16"" x 1/2"" (8.5 x 13 mm)- 180# Grit(Outer Dia.xLength): 5/16"" x 1/2"" (8.5 x 13 mm)- Sand Band Inner Diameter: 1/4"" (6.2 mm)- Shank Size of Drill Bits: 3/32"" (2.35 mm)- Material: Metal, emery- Net Weight: 0.46 Lb (0.21 kg). Package Contents:- 100x Sanding Bands 80# Grits for Nail Drill Bits- 100x Sanding Bands 120# Grits for Nail Drill Bits- 100x Sanding Bands 180# Grits for Nail Drill Bits- 1 Set of 30pcs Electric Nail File Drill Bits